ECMA 156 : 2ED 93

1 Scope
2 Conformance
3 References
4 Definitions
  4.1 Access code
5 List of acronyms
6 Keypad protocol
  6.1 General
  6.2 Messages and information elements used in the Keypad
      protocol
  6.3 Coding of the information elements
      6.3.1 Keypad facility information element
      6.3.2 Display information element
      6.3.3 Signal information element
  6.4 Elements of procedure
  6.5 Procedures at the invocation interface
      6.5.1 En-bloc sending of access codes from the TE to
            the PTN
      6.5.2 Overlap sending of access codes from the TE to PTN
      6.5.3 PTN response to user requests
      6.5.4 PTN prompting and in-band tone/announcement control
      6.5.5 Error conditions and treatment
  6.6 Sending of unsolicited information to the user
Annex A - Illustration of the keypad protocol
Annex B - Relationship to corresponding standards for public
          ISDNs
Annex C - Protocol Implementation Conformance Statement (PICS)
          proforma
Annex D - Other references

Defines the Keypad signalling protocol for the purpose of supplementary service control at an interface at the S reference point between a Terminal Equipment (TE) and a Private Telecommunication Network (PTN).